The study of three phase flow in horizontal and vertical pipe are important phenomena in oil and gas industry due to extracting process involve liquid, solid and gas phase. The effect of the particle amount, the discharge of gas and liquid have investigated experimentally on pressure distribution in horizontal pipe have been studied in this work. The work carried out for horizontal pipe with outer diameter (3.175 cm). A spherical stainless steel has used as solid particle. Air and water have used as gas and liquid phase respectively. Three different amount of gas discharge used namely 8.34, 16.67and 25 L/min. As well as, three different amount of liquid discharge used which are, 25, 30 and 35 L/min. It has found that the pressure distribution along horizontal pipe decrease with increase the air, liquid and particle amount.